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Supplemental Gas Data (unaudited) - Proved Undeveloped Reserves (Details)
Mcfe in Thousands, Mcf in Thousands, $ in Thousands, bbl in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Mcfe
well
Mcf
bbl
Dec. 31, 2020
USD ($)
Mcfe
well
bbl
Mcf
Dec. 31, 2019
USD ($)
Mcfe
bbl
Mcf
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Beginning balance (energy) 9,549,758 8,425,667 7,881,335
Revisions (energy) (327,050) 740,129 (518,570)
Price changes (energy) 86,532 (1,351,934) (45,246)
Extensions and Discoveries (energy) 906,738 2,246,968 1,647,297
Production (MMcfe) (590,248) (511,072) (539,149)
Ending balance (energy) 9,625,730 9,549,758 8,425,667
Proved developed resources (energy) 5,905,611 5,199,748 4,838,858
Proved undeveloped resources (energy) 3,720,119 4,350,010 3,586,809
Downward revision due to plan changes (energy) 356,000 677,000 872,000
Downward revision due to PUD removal (energy)     304,000
Upward revision from increased performance (energy) 331,000 579,000 657,000
Proved and unproved resources, extensions and discoveries (energy) 26,000 70,000 77,000
Increase in reserve due to decrease in operating costs (energy)   853,000  
Downward revision for acreage consolidation (energy) 267,000    
Downward revision due to 5 year rule (energy) 60,000    
Performance revision associated with proved developed producing assets (energy) 46,000    
Capital spent related to undeveloped reserves transferred to developed | $ $ 465,861 $ 487,291 $ 1,192,599
Downward revision due to risk in well development (energy) 20,000    
Reserves reported for more than five years 310    
Utica      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Number of wells removed from development plan | well   4  
Utica | Central Pennsylvania and Southwest Pennsylvania      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved and unproved resources, extensions and discoveries (energy) 405,000    
Number of dry gas wells added | well 16    
Marcellus      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Number of wells removed from development plan | well   23  
Marcellus | Southwest Pennsylvania and West Virginia      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved and unproved resources, extensions and discoveries (energy) 476,000    
Number of dry gas wells added | well 29    
Natural Gas      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Beginning balance (volume) | Mcf 9,034,066 7,938,406 7,436,338
Revisions (volume) | Mcf (409,215) 407,836 (521,617)
Price Changes (volume) | Mcf 82,248 (1,019,523) (40,773)
Extension and Discoveries (volume) | Mcf 832,696 2,188,773 1,569,813
Production (volume) | Mcf (551,988) (481,426) (505,355)
Ending balance (volume) | Mcf 8,987,807 9,034,066 7,938,406
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved developed resources (volume) | Mcf 5,569,332 4,939,283 4,473,534
Proved undeveloped resources (volume) | Mcf 3,418,475 4,094,783 3,464,873
NGLs      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Beginning balance (volume) | bbl 81,867 75,844 65,904
Revisions (volume) | bbl 13,655 51,857 5,926
Price Changes (volume) | bbl 692 (50,456) (740)
Extension and Discoveries (volume) | bbl 12,047 9,299 10,182
Production (volume) | bbl (5,976) (4,677) (5,428)
Ending balance (volume) | bbl 102,285 81,867 75,844
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved developed resources (volume) | bbl 53,204 42,204 59,800
Proved undeveloped resources (volume) | bbl 49,081 39,664 16,044
Condensate & Crude Oil      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Beginning balance (volume) | bbl 4,081 5,366 8,261
Revisions (volume) | bbl 39 3,525 (5,418)
Price Changes (volume) | bbl 22 (4,946) (5)
Extension and Discoveries (volume) | bbl 294 400 2,732
Production (volume) | bbl (400) (264) (204)
Ending balance (volume) | bbl 4,036 4,081 5,366
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved developed resources (volume) | bbl 2,843 1,207 1,087
Proved undeveloped resources (volume) | bbl 1,193 2,874 4,278
Proved Undeveloped      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Beginning balance (energy) 4,350,010    
Undeveloped Reserves Transferred to Developed (energy) (1,133,110)    
Extensions and Discoveries (energy) 880,965    
Ending balance (energy) 3,720,119 4,350,010  
Capital spent related to undeveloped reserves transferred to developed | $ $ 248,232    
Proved Undeveloped | Revisions Due to Five Year Rule      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) (59,948)    
Proved Undeveloped | Price Revisions      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) (4,939)    
Proved Undeveloped | Revisions Due to Plan Changes      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) (643,994)    
Proved Undeveloped | Revisions Due to Changes Related to Well Performance      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) 331,135